TY - JOUR

T1 - A two-ion fluid model with gyrotropic pressures for the comet interaction with the solar wind

AU - Gan-Baruch, Zameret

AU - Wegmann, Rudolf

AU - Eviatar, Aharon

AU - Schmidt, Hermann U.

N1 - Funding Information:
Z. Gmu-Baruch acknowledges V. Vasyliunas and H.G. Ludwig for helpful discussions, and H.U. Schmidt for &'Tanging her stays at the Max-Planck-Institut f'dr Astrophysik, Garching. Her work at Garching was sponsored, by the Minerva-Fellowships (Deutsch-Israelische Wissenschaftliche Zusammenarheit). The work at Te|-Aviv University was supported by the German-Israeli Foundation for Scientific Research and Development under grant 1-0199-163.07/91. The research at Johns Hopkins University Applied Physics Laboratory was supported under the NASA Voyager Grant NAGW-4901.

PY - 1997/7

Y1 - 1997/7

N2 - A two-ion fluid model (with gyrotropic pressure tensor) for the interaction of cometary pickup plasma with the solar wind has been developed. Whereas previous models have, in general, assumed a single fluid plasma, this generalized model follows the evolution of two fluids - solar wind protons and cometary ions. The two fluids are coupled by the magnetic field and by coupling terms which are the velocity moments of the time relaxation model of Bhatnagar-Gross-Krook. Furthermore, a gyrotropic pressure tensor replaces the isotropic pressure assumed in other models. Isotropization terms couple the pressures in the directions perpendicular and parallel to the magnetic field. A Godunov type upstream method which uses an approximate Riemann solver adapted to the model equations is presented.

AB - A two-ion fluid model (with gyrotropic pressure tensor) for the interaction of cometary pickup plasma with the solar wind has been developed. Whereas previous models have, in general, assumed a single fluid plasma, this generalized model follows the evolution of two fluids - solar wind protons and cometary ions. The two fluids are coupled by the magnetic field and by coupling terms which are the velocity moments of the time relaxation model of Bhatnagar-Gross-Krook. Furthermore, a gyrotropic pressure tensor replaces the isotropic pressure assumed in other models. Isotropization terms couple the pressures in the directions perpendicular and parallel to the magnetic field. A Godunov type upstream method which uses an approximate Riemann solver adapted to the model equations is presented.

KW - Approximate Riemann solver

KW - Comets

KW - Magnetohydrodynamics

KW - Space physics

KW - Upwind differencing

UR - http://www.scopus.com/inward/record.url?scp=0031193238&partnerID=8YFLogxK

U2 - 10.1016/s0010-4655(97)00033-7

DO - 10.1016/s0010-4655(97)00033-7

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AN - SCOPUS:0031193238

SN - 0010-4655

VL - 103

SP - 131

EP - 144

JO - Computer Physics Communications

JF - Computer Physics Communications

IS - 2-3

ER -